/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package jforum.util;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import jforum.actions.Action;
import jforum.actions.ActionFactory;

/**
 *
 * @author Вадим
 */
public class MainServlet extends HttpServlet {

    protected ActionFactory factory = new ActionFactory();

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try {
          Action action = factory.create(getActionName(request));
          String url = action.perform(request, response);
          if (url != null)
               getServletContext().getRequestDispatcher(url).forward(request, response);

        } /*catch (SQLException ex) {
            request.getSession().setAttribute("errorMessage", "В данный момент подключение к БД отсутствует. "+
                    "Попробуйте прийти позже.");
            getServletContext().getRequestDispatcher("/error.jsp").forward(request, response);
        }*/ catch (RuntimeException ex) {
            request.getSession().setAttribute("errorMessage", ex.getMessage());
            getServletContext().getRequestDispatcher("/error.jsp").forward(request, response);
        } catch (Exception ex) {
            throw new ServletException(ex);
        } finally {
            //close the em to release any resources held up by the persistebce provider
        }
    }

    protected String getActionName(HttpServletRequest request) {
          String path = request.getServletPath();
          return path.substring(1, path.lastIndexOf("."));
     }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
